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perf bpf: Fix metadata leak in perf_env__add_bpf_info() on duplicate insert

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When perf_env__insert_bpf_prog_info() returns false (duplicate
program), the error path frees info_linear and info_node but not
info_node->metadata.  If bpf_metadata_create() had succeeded, the
metadata allocation is permanently leaked.

Fix by calling bpf_metadata_free() on info_node->metadata before
freeing info_node.  bpf_metadata_free() handles NULL, so this is
safe even when bpf_metadata_create() returned NULL.

Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: fdc3441f2d ("perf record: collect BPF metadata from new programs")
Cc: Blake Jones <blakejones@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2026-06-08 08:12:04 -03:00
parent aece2b8966
commit a0e4362a3e
1 changed files with 1 additions and 0 deletions
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1
tools/perf/util/bpf-event.c
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@ -873,6 +873,7 @@ static int perf_env__add_bpf_info(struct perf_env *env, u32 id)
if (!perf_env__insert_bpf_prog_info(env, info_node)) {
pr_debug("%s: duplicate add bpf info request for id %u\n",
__func__, btf_id);
bpf_metadata_free(info_node->metadata);
free(info_linear);
free(info_node);
goto out;